JPS6234906B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an irreversible linear drive device in which a driven member can be driven from the driving member side, but the driving member cannot be driven from the driven member side. It is.

For example, in a car window opening/closing device, some type of irreversible drive is used to make the window pane move only when the handle is operated, and not even if force is applied directly to the window pane. It is necessary to provide equipment. As one of the above-mentioned window opening/closing devices, there is a known device in which a wire connected to a window plate is wound around a drum, and the drum is rotated by a handle to cause the wire to reciprocate and move the window plate up and down. However, conventionally, for a window opening device with such a configuration, a rotating shaft that rotates integrally with the handle and a gear for driving a drum provided on this rotating shaft are housed in a case, and a coil is housed inside the case. The spring is installed in elastic contact with the inner circumferential surface of the coil spring, and when the rotating shaft is rotated, the diameter of the coil spring decreases, reducing the frictional engagement between the coil spring and the case, and transmitting the rotation of the rotating shaft to the gear. Conversely, when the gear is rotated, the coil spring expands in diameter and the frictional engagement increases, which prevents the gear from rotating and prevents the rotating shaft from rotating. was.

However, in the case of an irreversible drive device with the above configuration, it is necessary to install the coil spring coaxially with the rotating shaft, and the case housing the rotating shaft and gears is required to have a corresponding thickness in the axial direction. However, there was a problem in that the attachment parts for the doors and the like inside the case became thick, and there was a desire for a device that did not require such thickness.

In view of the above points, an object of the present invention is to provide an irreversible linear drive device that does not require a large thickness.

Hereinafter, one embodiment of the present invention will be described in detail based on the drawings.

FIG. 1 shows an automobile window opening/closing device to which the device of the present invention is applied.
are provided, and the front and rear edges are fitted into the guide grooves 3 formed in the two edges 2a and 2b to form the window plate 4.
The window is opened and closed by sliding the window. The window plate 4 has its lower edge 4
a is held by the receiver 5 by fitting into a groove 6 of the receiver 5, and this receiver 5 is connected to a sliding member 7 that constitutes a part of an irreversible linear drive device A, which will be described in detail later. installed on. This sliding member 7 is arranged so as to be able to slide along a cylindrical guide tube 8 which is arranged parallel to the guide groove 3, and this guide tube 8 has a slit 9 that opens on the outer surface. It is formed in the direction and is fixed to fixtures 11, 11 provided on the inner wall 10 of the door 1.
Further, an operating unit 14 consisting of an operating handle 12 and a drum 13 is installed on the left side of the window plate 4, and the operating handle 12 and the drum 13 are each rotatably supported by a support plate 15 on the inner wall 10. and are operatively connected by gears 16 and 17, which rotate integrally with each other. A wire 18 serving as a driving member is attached to the drum 13.
is wound, and its both ends 18a and 18b are pulled out diagonally above and diagonally below this drum 13, and inserted into the hollow of the guide tube 8 from the upper end 8a or lower end 8b of the guide tube 8 through the inside of the conduit 19 or 20, respectively. As shown in FIG. 2, it is fixed to a cylindrical locking member 21 by caulking.

2 and 3 show the irreversible linear drive device A in detail. A pair of leg pieces 7a, 7b are protruded from the sliding member 7, and these leg pieces 7a, 7b face into the hollow space from the slit 9 of the guide tube 8 so as to straddle the locking member 21. ,
They correspond to both end surfaces 21a and 21b of the locking member 21 with a small gap therebetween. Further, the wire 18 includes
A coil spring 22 whose free length is shorter than the corresponding interval between the leg pieces 7a and 7b is attached so as to surround the locking member 21 and is in elastic contact with the inner circumferential surface of the guide tube 8. 22b protrudes between both ends 21a, 21b of the locking member 21 and the leg pieces 7a, 7b of the sliding member 7.

The present embodiment has the above configuration, and its operation will be explained next.

First, referring to FIG. 1, the outline of the operation of the automobile window opening/closing device to which the present invention is applied will be explained.
To close or open the window plate 4, rotate the operation handle 12 clockwise or counterclockwise to close or open the window plate 4.
As the wire 18 moves, the sliding member 7 is moved along the guide tube 8 via an irreversible linear drive device A, which will be described in detail later. The window board 4 held by the holder 5 attached to the sliding member 7 is raised or lowered along the window frame 2, thereby closing or opening the window.

Next, the operation of the irreversible linear drive device A will be explained with reference to FIG. First, when the wire 18 moves upward, the upper surface 21a of the locking member 21 fixed to the wire 18 hits and presses one end 22a of the coil spring 22, so that the coil spring 22 gradually moves from the one end 22a. The pitch between the coil wires is expanded and the diameter is reduced, and the frictional engagement with the inner peripheral surface of the guide tube 8 is reduced, so that the wire 1
8 can be smoothly moved upward as it is, and the sliding member 7 is moved together with one end 22a of the coil spring 22 being held between the upper surface 21a of the locking member 21 and the leg piece 7a. . Also wire 1
When the wire 8 is moved downward, the sliding member 7 moves together with the wire 18 due to the diameter reduction of the coil spring 22, as described above.

Next, when the window plate 4 shown in FIG. 1 is pushed down or when the sliding member 7 moves downward due to its own weight, the leg piece 7a is moved downward by the coil spring 2.
By colliding with one end 22a of the coil spring 22 and pressing it, the pitch between the coil wires is gradually contracted and the diameter of the coil spring 22 is expanded from the one end 22a, so that the coil spring 22 is frictionally engaged with the guide tube 8. As a result of this increase, the sliding member 7 cannot move any further and therefore the wire 18 cannot be moved. Further, even if the sliding member 7 moves upward, the movement is prevented by the diameter expansion of the coil spring 22, as described above.

In the irreversible linear drive device A of this embodiment, as shown in FIG.
are the leg pieces 7a, 7b of the sliding member 7 and the locking member 21.
The coil spring 22, the leg piece 7a,
It is essential to provide a clearance between the coil springs 22 and the locking member 21, but the clearance between the coil spring 22 and the locking member 21 is not necessarily required, and the reason for this will be explained below. First, assuming that there is no clearance between the coil spring 22 and the leg pieces 7a and 7b, when the wire 18 moves upward, the locking member 21 presses the one end 22a of the coil spring 22, as described above, and gradually starts from the one end 22a. The pitch expands, and an attempt is made to press the leg piece 7a to move the sliding member 7, but the length of the coil spring 22 in the tension direction is restricted by the leg pieces 7a and 7b. Therefore, the pitch is conversely contracted and the diameter is expanded from the other end 22b side, and the frictional engagement of this expanded portion increases, making it impossible for the wire 18 to move smoothly. The same thing can be considered when the wire 18 is moved downward, so it is necessary to provide a clearance between the coil spring 22 and the leg pieces 7a and 7b. On the other hand, considering the case where there is no clearance between the coil spring 22 and the locking member 21, when the wire 18 is first moved, if the locking member 21 presses the end 22a or 22b of the coil spring 22, the coil Since the length of the spring 22 in the tension direction is not restricted, the wire 18 can be moved as it is because the diameter is reduced over its entire length, and conversely, when the sliding member 7 is moved, the coil Since the length of the spring 22 in the compression direction is regulated by the locking member 21, its pitch is at the end 2.
Although it expands from the opposite end by the amount that is gradually contracted from 2a or 22b, the movement of the sliding member 7 can be sufficiently prevented by the friction of the portion where the diameter is expanded by contracting the pitch. , there is no practical problem even if no clearance is intentionally provided between the coil spring 22 and the locking member 21.

In the above embodiment, a flexible wire is used as the drive member, but the irreversible linear drive device according to the present invention uses a long and thin drive member that moves linearly in the axial direction. It goes without saying that all of these can be applied, and the same effects can be obtained even if, for example, a rigid bar or the like is used as the driving member.

As specifically explained in the above example,
In the irreversible linear drive device of the present invention, an elongated drive member is inserted into a guide tube in which an axial slit is formed so as to be freely movable in the axial direction, a locking member is fixed to the drive member, and a locking member is fixed to the drive member. A pair of legs protruding from a movably arranged driven member are passed through the slit and faced into the guide tube so as to straddle the locking member, and are aligned with both end surfaces of the locking member with a small gap. At the same time, a coil spring having a free length shorter than the corresponding interval between the pair of leg pieces is attached to surround the locking member and comes into elastic contact with the inner surface of the guide tube, and both ends of the coil spring are attached to the locking member. The main feature is that it protrudes between both end surfaces of the member and the pair of leg pieces, and since it is configured to act linearly, it can be applied along the axial direction of the elongated drive member, and at any given time. Therefore, when applied to the window opening/closing device of an automobile as shown in the embodiment, for example, the mounting part of a door or the like can be made extremely thin compared to the conventional one.

[Brief explanation of the drawing]

1 to 3 show one embodiment of the present invention. FIG. 1 is a perspective view schematically showing an automobile window opening/closing device to which the irreversible linear drive device of the present invention is applied, and FIG. 2 is a perspective view of the present invention. A perspective view showing an inventive irreversible linear drive device;
Moreover, FIG. 3 is a sectional view of the same. 7...Sliding member, 7a, 7b...(of the sliding member 7)
Leg piece, 8... Guide tube, 9... Slit, 18... Wire, 21... Locking member, 21a, 21b... End surface (of locking member 21), 22... Coil spring, 22
a, 22b... (of the coil spring 22) ends.

Claims (1)

[Claims] 1. A slender driving member is inserted freely in the axial direction into a guide tube in which an axial slit is formed, a locking member is fixed to the driving member, and a driven member disposed movably along the guide tube is inserted. A pair of protruding leg pieces are passed through the slit and faced into the guide tube so as to straddle the locking member, and correspond to both end surfaces of the locking member with a small gap, and the free length is set so that the free length is equal to that of the pair of legs. A coil spring shorter than the corresponding spacing between the pieces is attached so as to surround the locking member and come into elastic contact with the inner surface of the guide tube, and both ends of the coil spring are connected to both end surfaces of the locking member and the pair of legs. An irreversible linear drive device characterized by a protrusion between the pieces.